[security] LibCURL.jl (actually Libcurl_jll) has a security issue, upgrade to 7.84.0

Hi,

See PR I started here:
https://github.com/JuliaLang/julia/pull/45839

I'm not sure where the main place to fix this is, seemingly in Libcurl_jll, can someone take over, to do that? I'll likely not fix the other PR (soon), and unclear if JuliaLang should even have LibCURL (or i.e. just depend on this package)?